<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>盒子</title>
		<style>
			*{
				margin: 0;
				padding: 0;
				
			}
			.dhz{
				width: 600;
				height: 600;
				background-color: pink;
				margin-top: 100px;
				border: 1px solid red;
				
			
			}
			.er{
				width: 300;
				height: 300;
				background-color: skyblue;
				margin-top: 100px;
			}
		</style>
	</head>
	<body>
		<div class="dhz">
			<div clas="er">
				
			</div>
			
		</div>
	</body>
</html>
